Have you ever heard of selecting bulls that excel in daily weight gain? Weaning weight, yearling weight, etc.?These are called performance tests and have some problems in design and when they measure an animal.

We almost always select the Bulls that have gained the most in a performance or daily gain test. Why don't we select those that gain less per day? What does the breeder think when he makes the decision to choose his next Bull or ram?

Now, let's analyze what the daughters of the bulls or males we choose need in order to be profitable under low inputs in a real-life situation, and at high to very high stocking rates.